Steam-boiler furnace



H. J. WEBSTER STEAM BOILER FURNACE Filed Sept. 23, 1924 -2 Sheets-Sheet 1 fitter nag July 14, 1925. 1,545,715

H. J. WEBSTER STEAM BOILER FURNACE Filed Sept. 23, 1924 2 Sheets-Shoot 2 311 under,

mTNEsifg Z l W 931 v Patented July 14,- 1925.

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Ap p1icationfi1cd September 23, 1924. Seria1No.,739,296.

To all when it may concern:

Be it known that I, Howlum J. hsns'rnu, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Boiler Furnaces, of which the following is a specification.

My invention relates to improvements in furnaces, and more especially of the smokeless type used in connection with horizontal return fire tube type of boiler in which'the lower section of the boiler shell is disposed over the combustion chamber of the furnace and the hot gases after flowing the length of the boiler in one direction and impinging against and radiating their heat against the underside of the boiler shell, pass through the longitudinal tubes within the boiler in the opposite direction and out to the stack. The objects of the invention are: First, to construct, arrange and proportion the cross-sectional areas of the fuel and combustion chambers at and along various points along the longitudinal axis of'the furnace so as to provide a thorough and proper mixture of the gases and oxygen to effecta uniform and smokeless combustion and maximum production of heat and carbon dioxide, thereby reducing to a minimum and eliminating as far as possible the escape of carbon monoxide or unconsumed carbon and other gases up the stack.

Second, to so construct, arrange and proportion the said cross-sectional areas along the longitudinal axis of the furnace so as to produce a novel and efficient type of downdraft furnace with the combustion chamber extending from and over the fuel or fire chamber to the rear immediately in front of and passing through a particularly formed V-notch or weir interposedbetween the rear end of the grate or fuel bed and rear end of the boiler. j V

Third, to construct the fuel and combustion chambers with respect to the lower section of the boiler shell so that the heat of the burning gases andproducts of combustion is diverted from the; bottom of the shell of the boiler where incrustation takes place and lead or convey said heated gases and products of combustion to the two sides of the boiler shell which are free from any incrustation.

Fourth, to construct the fuel and combusn'cham e as above nducted to P vent anymud or scale formed in the boiler from beingover or in proximity to the zone of great heat, thereby not only preventing burning or bagging of the boiler shell, but at the same time increasing the steam producing efficiency of the combined furnace and boiler.

Fifthytofso' construct and arrange the fire briclrof the furnace with respect to the boiler shell and the feed water inlet or blow-off pipe so that no intense flame or heat of the furnace makes impact against said pipe or the section of shell through which said pipes pass.

Sixth, other objects and advantages of construction and operation of the invention will appear and be apparent from the detailed disclosure to be presently given.

The invention consists of structural characteristics and relative arrangements of elements which will be hereinafter more fully described and particularly pointed out in the appended claims.

In the two'sheets'of drawings in which similar reference characters indicate the same parts in the several figures:

Figure 1 is a top plan view of the fur-.

a modified-form of the invention.

Figure 5 is a sectional view similar to Figure 2, taken on line -VV.

Figure 6 is a sectional View taken on line VIVI of Figure 5. r i

Figure 7 'is a section taken on line VIIVII of Figure 2, and Figure 8 is a section VIII VIII of Figure 5.

' Referring to Figures 1,2, 3 and 7, 10 is the lower half of a cylindrical boiler shell preferably provided with the improved arrangement and grouping of fire tubes as disclosed in my copending application, serial No. 585,966, filed September 2 1923, and forms no part of the present invention and needs no further disclosure, for the re son that o er and similar return fire tube taken on line boilers may be used with the present improved furnace construction.

Said boiler shell is properly supported in any of the well known and approved manners and is encased by the usual furnace front 11, provided with the separate and recent U. S. Patent, No. 1,464,190, dated August 7, 1923,

The fuel chamber 18 under the forward end of the boiler shell or furnace communicates with the rear fire chamber by a combustion passageway 20 directly underthe rear sectionof the lower side of the boiler shell 10 and extending from the bridge wall.

21 to the fire chamber 15, and bottom of I said passageway is concave in general con tour and made to partially conform to the curvature of said shelllO by fire brick work 22 as indicated, in order to have the heat of the furnace gases deflected and made to impinge against the underside of the boiler shell. Said brickwork 22 has a portion of the central section along the longitudinal axis of the furnace and equi-distant on each side of said axis elevatedor raised toform a medial wall 23 for the purpose of assisting the deflection of the gases from the lowest sect-ion of the boiler shell whereinerustation is apt to form and hence cause the boiler shell to burn at this point, and at the same time fully protect the feed water or blowoff pipe 24- and rear end of the boiler shell where said feed water or pipe enters, thereby insuring long life and tight connection between the boiler and feed water or blow-off pipe and prevention of clogging up of said feed water or blow-off pipe by mud, incrustation or other similar matter. Preferably embedded in the bridge wall are one or more pipes 211 connected to any suitable supply of compressed air or steam and which terminate in openings or nozzles 212-, for the purpose of injecting auxiliary air. or steam or both back of the bridge wall 21 and over the fuel bed for the purpose of augmenting the supply of oxgen as is common in this class of inventions and needsno further disclosure. In the furnace between the bridge'wall 21 and the forward end or section of the brick work 22 ofthe combustion passageway 20 is. interposed a transverse. and upright wall 25 which is shaped with a central V-shaped notch 26, forming a Vshaped weir having the function of contracting and controlling the passage of the gases beyond this point for purposes to be presently described.

Referring to the modified form of the invention illustrated in Figures 4:, 5, 6 and 8, the same general arrangement and construction as to the boiler shell 10, furnace front 11, fuel openings 12, 12, ash pit opening 13, back wall 14, fire chamber 15 and its opening 16, grate bars 17, fuel chamber 18, ash pit 19, combustion passageway 20, bridge wall 21, upright wall 25, notch 26, and brickwork 22 as described with reference to Figures 1, 2, 3 and 7, except the said brick work 22 has its elevated central longitudinal section or medial wall 23 slightly of less height at its rear section and is below the outersurface of the boiler shell 10, as is clearly shown in Figures 5 and 6, for the reason that the feed water is supplied or blow-off is effected at the forward end of the boiler by pipe 24, as shown in Figure 5,

and while I have shown and described the boiler shell in contact with the medial wall 23 in Figure 2, this is not absolutely necessary as the said medial wall could be slightly depressed or lowered from said shell, as shownin Figures 5 and 6, and all the functions of the proper circulation of the water in the boiler and prevention of the burning of the boiler shell would be effected, and the efliciency of the plant would be undisturbed.

During the; alternate firing of thefurnace through the fuel doors 12, 12 and operation of the furnace, the gases distilled from the green fuel mixed with the proper supply of.

air or oxygen assume two currents and take the two paths indicated by the arrows in the several figures of the drawings, and, as shown, first upward and forward and then above and forward along the bottom of the boiler shell and impinging against the same, and the two currents or streams of gases collide or impinge against each other andwith the proper supply of air, said commingled air and currents of gases meet at and pass through the V-notch or weir opening 26, and owing to the wider section of the weir opening 26 being at the top and below the center of the boiler 'shell causes a downward movement of the burning gases and said gases are divided or parted into two distinct currents or paths by the medial wall.

tact or impinge and radiate their heat 12, 0

against the right and left lower halves of the boiler shell where no scale, mud or other impurities will lodge or incrustation be formed. I

The same operation is substantially car- ,ried out in the modified form, as shown by the arrows in Figures 4, 5 and 6, except that in said figures the currents "of gases are simplv divided'a'nd diverted from the lowest sectionof the boiler shell where the mud, silt or incrustation is usually depositedcorformed and with cases of ordinary neglect in firing or operating a boiler with the customary accumulation of mud sedimentor scale, the boiler shell will not burn or bag. F

From the foregoing disclosure as to construction, 1node of operationand advantages of my invention, itwill be readily seen that allthe objects recited in mystatement of invention are fully carried out, and while I have described and shown my preferred form of invention, I do not limit myself to these specific forms, as many changes and modifications will readilysuggest themselves to anyone skilled in the art.

lVhat I claim is: j j

- 1. A furnace comprising a front fuel chamber, a rear fire chamber, a bridge'wall, a longitudinal combustion passageway ex-j tending from the fuel chamber to the rear fire chamber and arranged under the lower half of a boiler shell, an upright wall provided with a central notch and arranged transversely across said combustion passageway between the bridge wall and rear fire chamber with the widest section or open end of the notch adjacent to the boiler shell and the bottom of the combustion passage between the upright wall and fire chamber being provided with a projecting longitudinal medial wall extendingfrom the lower portion of the notch to the rear fire chamber.

' 2. A furnace comprising a front fuel chamber, a rear fire chamber, a bridge wall, a longitudinal combustion passageway 6X- tending from the fuel chamber'to the rear fire chamber and arranged under the lower half of a boiler shell, an upright wallprovided with-a V-shaped notch or weir and arranged transversely across said combustion passageway between the bridge wall and rear fire chamber with the widest section or open end of the notch adjacent to the boiler shell and the bottom of the combustion passage between the upright wall and fire chamber being provided with a projecting longitudinal medial wall extending from the lower portion of the V-notch or weir to the rear fire chamber.

3. A furnace comprising a front fuel chamber, a rear fire chamber, a bridge wall,

a longitudinal combustion passageway ex tending from the fuel chamber to the rear fire chamber and arranged under the lower half of a boiler shell, an upright wall pro vided with a V-shaped notch or weir and arranged transversely across said combustion passageway between the bridge wall and rear fire chamber with the widest section or open end of the notch adjacent to the boiler shell and the bottom of the combustion passage betweenthe upright wall and fire chamber being substantiallyconcave in form and pr0- vided with a projecting longitudinal medial wallex tendingfrom the lower portion of the V'-notch or weirto the rear fire chamber.

4. A furnace comprising a front fuel chamber, arear fire chamber,- a bridge wall, a longitudinal combustion passageway extending from the fuel chamber to the rear firechamber andJarran ed under the lower 7 half of a boiler shell, an upright wallprovided witha V-shaped notch or weir and arranged transversely and entirely across said combustion passageway between the bridge wall and rear fire chamberwith the widest section or open end of thenotchadjacentLto-and below the boiler shell and the bottom of the combustion passage'between the upright wall and fire chamber being provided with aprojecting wallextending from the lower portion of the V notch or weir to the rear fire chamber. I

urnace comprising a front fuel chamber, a rear fire chamber, a bridgewall, a' longitudinal combustion passageway extending from the fuel chamber to the rear longitudinal medial fire chamber and arranged under the lower half of a boiler shell, an upright wall provided with a V-shaped notch or weir and arranged transversely and entirely across said combustion passageway between the bridge wall and rear fire chamber with the widest section or open end of the notch adjacent to and below the boiler shell and the bottom of the combustion: passage between the upright wall and fire chamber being substantially concave and provided with a projecting longitudinal medial wall extending from the lower portion of the \l-notch or weir to the rear fire chamber.

6. A furnace comprising a front fuel chamber, a rear fire chamber, a bridge wall,

a longitudinal combustion passageway ex boiler shell and the bottom of the combustion passage between therupright wall and fire chamber being provided with a pro ecting the lower portion of the notch or weir to the rear fire chamber and covering up or protecting said water inlet or blow-off pipe and section of boiler shell adjacent to and connected with the pipe from the heat of the furnace gases passing through the combustion passageway. j i

7. A furnace comprising a front fuel chamber, a rear fire chamber, a bridge wall,

longitudinal medial wall extending from a longitudinal combustion passageway extending from the fuel chamber to the rear fire chamber and arranged under the lower half of a boiler shell having a feed water inlet or blow-off pipe connected thereto, an upright wall providedwith a V-shaped notch or weir and arranged transversely and entirely across said combustion passageway between the bridge wall and rear fire chamber with the widest section or open end of the notch adjacent to the boiler shell and the bottom of the combustion passage between the upright wall and fire chamber being substantially concave and provided with a projecting longitudinal medial wall extending from the lower portion of the V-notch or weir to the rear fire chamber and covering up or protecting said feed water inlet or blow-oil pipe and section of I boiler shell adjacent to and connected with the pipe from the heat of the furnace gases passing through the combustion passageway. 8. A furnace comprising a front, fuel chamber, a rear fire chamber, a longitudinal combustion passageway extending from the fuel chamber to the rear fire chamber and arranged under the lower halfof a boiler shell having a feed water or blow-'ofi pipe connected thereto, an upright wall provided with arr-opening and arranged transverely across said combustion passageway between the fuel chamber and rear fire chamber and the bottom of the combustion passage between the upright wall and fire chamber being provided with a projecting longitudinal medial wall extending from the lower and rear side of the wall to the rear fire chamber and covering up or protecting said feed water inlet or blow-ofi pipe and section of boiler she-ll adjacent to and connected with the pipe from the heat of the furnace gases passing through the combustion passageway.

In testimonywhereofl hereunto aflix my signature. v i HOWARD J. WVEBSTER. 

